嵌套DataGrid，中如何添加删除事件?(望能暂时放一下，谢谢了！)

我在DataGrid1的绑定列中嵌套了DataGrid2，然后在DataGrid2中增加删除事件，请问高手，这个事件应该怎么写？如何去获取呢？
请各位高手指教。

    <asp:DataGrid id="DataGrid1" runat="server" Width="688px" AutoGenerateColumns="False" AllowPaging="True"
        DataKeyField="projectid">
        <Columns>
            <asp:BoundColumn DataField="name" HeaderText="项目名称"></asp:BoundColumn>
            <asp:TemplateColumn HeaderText="任务">
                <ItemTemplate>
                    <asp:Label Runat="server" ID="lbl_project" Visible="False" ForeColor="#ff0033"></asp:Label>
                    <asp:DataGrid id="DataGrid2" runat="server" Width="100%" AutoGenerateColumns="False" AllowPaging="false"
                        ShowHeader="False">
                        <Columns>
                            <asp:TemplateColumn>
                                <ItemTemplate>
                                    <%# Container.ItemIndex + 1%>
                                </ItemTemplate>
                            </asp:TemplateColumn>
                            <asp:TemplateColumn>
                                <ItemTemplate>
                                    <asp:HyperLink Runat="server" ID="title">    
                                        <%#DataBinder.Eval(Container.DataItem,"name")%>
                                    </asp:HyperLink>
                                    <asp:Label Runat="server" ID="Label1" Visible="false" text='<%#DataBinder.Eval(Container.DataItem,"id")%>'></asp:Label>

                                </ItemTemplate>
                            </asp:TemplateColumn>
                            <asp:TemplateColumn>
                                <ItemTemplate>
                                </ItemTemplate>
                            </asp:TemplateColumn>
                        </Columns>
                    </asp:DataGrid>
                </ItemTemplate>
            </asp:TemplateColumn>
        </Columns>
        <PagerStyle Mode="NumericPages"></PagerStyle>
    </asp:DataGrid>